Question Author
I've been poking around the Paypal site, but although others are asking similar questions (via Google), no answers are forthcoming.
I do have TWO exclusive 'monetary' emails, both of which are listed on Paypal, and only one of which I use when logging in to Paypal. This is the one that gets adverts, spam, requests for dosh (from charities), and so on.
It might be just Paypal's inferior system - you don't get this with Amazon, where everything is at arm's length. You and the seller never communicate directly, only through Amazon.
Bill.